Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d99befa16622b50…

MALICIOUS

PDF

88.3 KB Created: 2021-07-09 20:04:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 915b07539d188b3e17d3373da3107498 SHA-1: 7efd9f33836d7a4fe0166d0cd3777ce98c5464e9 SHA-256: 8d99befa16622b50bca7050600f2f098023ac2a180e3af619cfa2df69e74ee0b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://allytemp.ru/uplcv?utm_term=persona+4+dancing+all+night+characters PDF link annotation
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1d98d7765---xusoxuzif.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b3ad489a716f092ce202e87f8a940779/kavubobonutenifekaru.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/38173333900.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/b7b5ef43760c9b09d8bf06f98e2b61f9/sosinedijunonoda.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/buvetelawavukepul.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607a775a24e7a---7244197095.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c05f772b37---rababe.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/jenulemogilikomi.pdfIn PDF document text
    • http://blackshirts1962.com/clients/f/f2/f245580d3072b78cda2271cf7a7e3f61/File/nabinepazosugalatigupoxi.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/57414900993.pdfIn PDF document text
    • http://sireny.net/share/files/kesozitozazavevopezusoki.pdfIn PDF document text
    • http://ddrwc.net/clients/869849/File/natosozupegamilapulin.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/s8c6bad7jbbijbkqifr844pmk8/102859218.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/86457421647.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/41873059263.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/85300963629.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/39243493309.pdfIn PDF document text
    • http://armanetti.com/images/89831356365.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/1de84d604f760452949960c722ea8d24/gipavuxopazijevifun.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/b613b1e19cd075f7907d4faecabfef14/boxinim.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/1f21e94d2b0a85eb250802c47135c6ff/2012590239.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/pts24630tdu6ca3n4gg1op68d5/86935591870.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/022ac7e207e531f6fd84600016459653/19328191766.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/65553210655.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E0 17588 bytes
SHA-256: 48f909a1f3fd450f0fd00b92ba76b938b2c700df4d4692445172853be6997f14
font_01_sfnt_off0001237b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237B 10728 bytes
SHA-256: 1957fbb18013d418873ae49c6e84eb6780e1ccca1221955956779e36e62e79c4
font_02_sfnt_off00013be4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1